body {
  font: 14px/1.5 Arial, sans-serif;
  color: #F2F2F2;
  background: linear-gradient(90deg, #F5FEFF 11%, #BDDAFF 100%);
}


.gridfor4 {
  display: grid;
  grid-template-columns: repeat(2, 1fr); /* 两列等宽 */
  gap: 20px;
  justify-content: center;
  max-width: 80%;
  margin: 50px auto;
}

/* 每个宫格大小固定 */
.gridfor4-item {
  width: 100%;
  aspect-ratio: 16 / 9;
  object-fit: fill;
  border-radius: 10px; 
  box-shadow: 0 5px 15px rgba(0, 0, 0, 0.3);
}